HOMEVULNERABILITIESCVE-2023-4527
MEDIUM

CVE-2023-4527

CWE-121Published: September 18, 2023· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data, and may cause a crash.

NVD Source

Technical Analysis

CVE-2023-4527 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Affected Vendors & Products

Fedora1 product(s)
fedora
gnu1 product(s)
glibc
netapp10 product(s)
h300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh410s firmwareh410sh410c firmwareh410c
Red Hat20 product(s)
codeready linux builder euscodeready linux builder eus for power little endiancodeready linux builder eus for power little endian euscodeready linux builder for arm64codeready linux builder for arm64 euscodeready linux builder for ibm z systemscodeready linux builder for ibm z systems eusenterprise linuxenterprise linux eusenterprise linux for arm 64enterprise linux for arm 64 eusenterprise linux for ibm z systems+8
Source: NVD CPE · 38 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://access.redhat.com/errata/RHSA-2023:5453
ADVISORYhttps://access.redhat.com/errata/RHSA-2023:5455
ADVISORYhttps://access.redhat.com/security/cve/CVE-2023-4527
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=2234712
ADVISORYhttp://www.openwall.com/lists/oss-security/2023/09/25/1
ADVISORYhttps://access.redhat.com/errata/RHSA-2023:5453
ADVISORYhttps://access.redhat.com/errata/RHSA-2023:5455
ADVISORYhttps://access.redhat.com/security/cve/CVE-2023-4527
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=2234712
ADVISORYhttps://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/
ADVISORYhttps://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/
ADVISORYhttps://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/
ADVISORYhttps://security.gentoo.org/glsa/202310-03
ADVISORYhttps://security.netapp.com/advisory/ntap-20231116-0012/

All References (16)

→
https://access.redhat.com/errata/RHSA-2023:5453Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2023:5455Third Party Advisory
→
https://access.redhat.com/security/cve/CVE-2023-4527Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2234712Exploit · Issue Tracking · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2023/09/25/1Mailing List · Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2023:5453Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2023:5455Third Party Advisory
→
https://access.redhat.com/security/cve/CVE-2023-4527Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2234712Exploit · Issue Tracking · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202310-03Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20231116-0012/Third Party Advisory
→
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

Quick Facts

CVE IDCVE-2023-4527
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-121
CISA KEVNo
Affected4 vendor(s)
PublishedSep 18, 2023

Related CVEs (CWE-121)

CVE-2021-21961
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CVE-2026-12847
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CVE-2021-21960
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CVE-2020-14498
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CVE-2026-37541
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CVE-2026-42996
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-4527 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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